<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        /* 通配符清除所有的margin 和padding 一定要写在最上面 */
        *{
            margin: 0;
            padding: 0;
            list-style: none;
        }
        a{
            text-decoration: none;
        }

        .box {
            width: 200px;
            height: 200px;
            border: 1px solid red;
        }
        ul{
            list-style-type: square;
        }
    </style>
</head>

<body>
    <ul>
        <li>
            qwertyu
        </li>
    </ul>
    <div class="box">

    </div>
</body>

</html>